and idls around 2000 when at operating temps. Could this be a sign of a bad 02 sensor? Or what? There are no codes thrown or stored. It's an 89 Camaro 2.8

 

Very possibly a bad intake manifold leak (vacuum leak). You are most likely sucking air somewhere after the throttle body.

 

Thanks for your reply. A little recent hostory. 2 weeks ago I drove in a flooded intersection ( about 18" deep), and the engine stalled. I blew the top of the EGR valve off. The car sat therefor about 2 hours. A lot of leanup later, I have it running after replacing the EGR valve and connecting a few vaccuum hoses back. Pulls almost 17" of vacuum, so I can not see a leak on the intake side happening. I'm wondering if the o2 sensor got wet, what the effects would be.

 

When I say "vacuum leak" I don't mean the vacuum lines- I mean a bad gasket in the intake somewhere that is sucking air as the engine idles- this will raise rpm idle levels- your vacuum line pressure will remain fine.

 

I highly doubt an O2 sensor would have an effect like that. O2 is gonna make you run rich or lean, depending...... When they're old and start to fail, they typically make you run rich. I think the O2 sensors are linked by a Weatherpak connector, which is supposed to be pretty waterproof.....and I doubt anything happened to the wiring itself. And of course no water got in the pipe to damage it.... So again, I highly doubt your O2 sensor is the problem.

Any other symptoms besides the very high idle? Does the car drive fine? Any stalling/chugging, etc.? Any check engine lights?